I have only driven a 335i 2x at the strip. First time (stock 6MT) I ran a 14.0 @ 104. The clutch delay valve still installed...
2nd time (RR-CDV + SSTT) I ran a 13.1 @ 106. I think the RR-CDV made up more of that 0.9 than the SSTT. Car still had small shift delays, especially 3rd to 4th, though WAY less than with the stock CDV in. I think that is mostly due to boost loss during shifting. That same day the clutch blew out. The new clutch seems to have a little less shift delay, but still some is there. I think this car has about a 12.8 @ 108 in it on a good day/driver.
Once again, I am talking about a car with SSTT and RR-CDV, 6MT. July 2008 build with I think 30.0.2 (maybe 29.2).